Copy/paste/duplicate has no effect on Linux

Attempting to copy/paste or duplicate a node in blueprint or HUD element in a widget blueprint does not create a copy of the node or element.

Edit:
This also applies to copying nodes in the material editor as well. (https://answers.unrealengine.com/questions/324160/bug-report-cant-copy-in-blueprint-editor-and-mater.html)

1. Open UE4Editor (any project)
2. Create new blueprint based on actor
3. Add Print node to event graph
4. with Print node selected, press ctrl+C to copy the node and ctrl+V to paste a copy

Result:
No copy is created when pasting the node.

Fix UE-51650

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